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Hamouda RA, Almaghrabi FQ, Alharbi OM, Al-Harbi ADM, Alsulami RM, Alhumairi AM. Antifungal Activities of Biogenic Silver Nanoparticles Mediated by Marine Algae: In Vitro and In Vivo Insights of Coating Tomato Fruit to Protect against Penicillium italicum Blue Mold. Mar Drugs 2024; 22:225. [PMID: 38786616 PMCID: PMC11122932 DOI: 10.3390/md22050225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/06/2024] [Accepted: 05/13/2024] [Indexed: 05/25/2024] Open
Abstract
In an attempt to reduce such decay induced by pathogenic causes, several studies investigated the effectiveness of nanoparticles (NPs) that play a vital role in saving food products, especially fruits. Current research delves into biogenic silver nanoparticles (using marine alga Turbinaria turbinata (Tt/Ag-NPs) and their characterization using FT-IR, TEM, EDS, and zeta potential. Some pathogenic fungi, which cause fruit spoilage, were isolated. We studied the impact of using Tt/Ag-NPs to protect against isolated fungi in vitro, and the influence of Tt/Ag-NPs as a coating of tomato fruit to protect against blue mold caused by Penicillium italicum (OR770486) over 17 days of storage time. Five treatments were examined: T1, healthy fruits were used as the positive control; T2, healthy fruits sprayed with Tt/Ag-NPs; T3, fruits infected with P. italicum followed by coating with Tt/Ag-NPs (pre-coating); T4, fruits coated with Tt/Ag-NPs followed by infection by P. italicum (post-coating); and T5, the negative control, fruits infected by P. italicum. The results displayed that Tt/Ag-NPs are crystalline, spherical in shape, with size ranges between 14.5 and 39.85 nm, and negative charges. Different concentrations of Tt/Ag-NPs possessed antifungal activities against Botrytis cinerea, Rhodotorula mucilaginosa, Penicillium expansum, Alternaria alternate, and Stemphylium vesicarium. After two days of tomatoes being infected with P. italicum, 55% of the fruits were spoilage. The tomato fruit coated with Tt/Ag-NPs delayed weight loss, increased titratable acidity (TA%), antioxidant%, and polyphenol contents, and decreased pH and total soluble solids (TSSs). There were no significant results between pre-coating and post-coating except in phenol contents increased in pre-coating. A particular focus is placed on the novel and promising approach of utilizing nanoparticles to combat foodborne pathogens and preserve commodities, with a spotlight on the application of nanoparticles in safeguarding tomatoes from decay.
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Affiliation(s)
- Ragaa A. Hamouda
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
- Microbial Biotechnology Department, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat City 32897, Egypt
| | - Fatimah Q. Almaghrabi
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
| | - Ohoud M. Alharbi
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
| | - Abla D. M. Al-Harbi
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
| | - Rahaf M. Alsulami
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
| | - Abrar M. Alhumairi
- Department of Biology, College of Sciences and Arts Khulais, University of Jeddah, Jeddah 21959, Saudi Arabia; (F.Q.A.); (O.M.A.); (A.D.M.A.-H.); (R.M.A.); (A.M.A.)
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Silveira CM, Zuccarello L, Barbosa C, Caserta G, Zebger I, Hildebrandt P, Todorovic S. Molecular Details on Multiple Cofactor Containing Redox Metalloproteins Revealed by Infrared and Resonance Raman Spectroscopies. Molecules 2021; 26:4852. [PMID: 34443440 PMCID: PMC8398457 DOI: 10.3390/molecules26164852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 08/06/2021] [Accepted: 08/07/2021] [Indexed: 12/12/2022] Open
Abstract
Vibrational spectroscopy and in particular, resonance Raman (RR) spectroscopy, can provide molecular details on metalloproteins containing multiple cofactors, which are often challenging for other spectroscopies. Due to distinct spectroscopic fingerprints, RR spectroscopy has a unique capacity to monitor simultaneously and independently different metal cofactors that can have particular roles in metalloproteins. These include e.g., (i) different types of hemes, for instance hemes c, a and a3 in caa3-type oxygen reductases, (ii) distinct spin populations, such as electron transfer (ET) low-spin (LS) and catalytic high-spin (HS) hemes in nitrite reductases, (iii) different types of Fe-S clusters, such as 3Fe-4S and 4Fe-4S centers in di-cluster ferredoxins, and (iv) bi-metallic center and ET Fe-S clusters in hydrogenases. IR spectroscopy can provide unmatched molecular details on specific enzymes like hydrogenases that possess catalytic centers coordinated by CO and CN- ligands, which exhibit spectrally well separated IR bands. This article reviews the work on metalloproteins for which vibrational spectroscopy has ensured advances in understanding structural and mechanistic properties, including multiple heme-containing proteins, such as nitrite reductases that house a notable total of 28 hemes in a functional unit, respiratory chain complexes, and hydrogenases that carry out the most fundamental functions in cells.
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Affiliation(s)
- Célia M. Silveira
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Av. da República, 2780-157 Oeiras, Portugal; (C.M.S.); (L.Z.); (C.B.)
| | - Lidia Zuccarello
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Av. da República, 2780-157 Oeiras, Portugal; (C.M.S.); (L.Z.); (C.B.)
| | - Catarina Barbosa
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Av. da República, 2780-157 Oeiras, Portugal; (C.M.S.); (L.Z.); (C.B.)
| | - Giorgio Caserta
- Institut fur Chemie, Sekr. PC14, Technische Universitat Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany; (G.C.); (I.Z.); (P.H.)
| | - Ingo Zebger
- Institut fur Chemie, Sekr. PC14, Technische Universitat Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany; (G.C.); (I.Z.); (P.H.)
| | - Peter Hildebrandt
- Institut fur Chemie, Sekr. PC14, Technische Universitat Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany; (G.C.); (I.Z.); (P.H.)
| | - Smilja Todorovic
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Av. da República, 2780-157 Oeiras, Portugal; (C.M.S.); (L.Z.); (C.B.)
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Reed CJ, Lam QN, Mirts EN, Lu Y. Molecular understanding of heteronuclear active sites in heme-copper oxidases, nitric oxide reductases, and sulfite reductases through biomimetic modelling. Chem Soc Rev 2021; 50:2486-2539. [PMID: 33475096 PMCID: PMC7920998 DOI: 10.1039/d0cs01297a] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Heme-copper oxidases (HCO), nitric oxide reductases (NOR), and sulfite reductases (SiR) catalyze the multi-electron and multi-proton reductions of O2, NO, and SO32-, respectively. Each of these reactions is important to drive cellular energy production through respiratory metabolism and HCO, NOR, and SiR evolved to contain heteronuclear active sites containing heme/copper, heme/nonheme iron, and heme-[4Fe-4S] centers, respectively. The complexity of the structures and reactions of these native enzymes, along with their large sizes and/or membrane associations, make it challenging to fully understand the crucial structural features responsible for the catalytic properties of these active sites. In this review, we summarize progress that has been made to better understand these heteronuclear metalloenzymes at the molecular level though study of the native enzymes along with insights gained from biomimetic models comprising either small molecules or proteins. Further understanding the reaction selectivity of these enzymes is discussed through comparisons of their similar heteronuclear active sites, and we offer outlook for further investigations.
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Affiliation(s)
- Christopher J Reed
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urban, IL 61801, USA.
| | - Quan N Lam
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urban, IL 61801, USA
| | - Evan N Mirts
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA and Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yi Lu
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urban, IL 61801, USA. and Department of Biochemistry, University of Illinois at Urbana-Champaign, Urban, IL 61801, USA and Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA and Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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Melin F, Hellwig P. Redox Properties of the Membrane Proteins from the Respiratory Chain. Chem Rev 2020; 120:10244-10297. [DOI: 10.1021/acs.chemrev.0c00249] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Frederic Melin
- Chimie de la Matière Complexe UMR 7140, Laboratoire de Bioelectrochimie et Spectroscopie, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67070 Strasbourg, France
| | - Petra Hellwig
- Chimie de la Matière Complexe UMR 7140, Laboratoire de Bioelectrochimie et Spectroscopie, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67070 Strasbourg, France
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Melin F, Xie H, Meyer T, Ahn YO, Gennis RB, Michel H, Hellwig P. The unusual redox properties of C-type oxidases. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:1892-1899. [PMID: 27664317 DOI: 10.1016/j.bbabio.2016.09.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 09/15/2016] [Accepted: 09/19/2016] [Indexed: 10/21/2022]
Abstract
Cytochrome cbb3 (also known as C-type) oxidases belong to the family of heme-copper terminal oxidases which couple at the end of the respiratory chain the reduction of molecular oxygen into water and the pumping of protons across the membrane. They are expressed most often at low pressure of O2 and they exhibit a low homology of sequence with the cytochrome aa3 (A-type) oxidases found in mitochondria. Their binuclear active site comprises a high-spin heme b3 associated with a CuB center. The protein also contains one low-spin heme b and 3 hemes c. We address here the redox properties of cbb3 oxidases from three organisms, Rhodobacter sphaeroides, Vibrio cholerae and Pseudomonas stutzeri by means of electrochemical and spectroscopic techniques. We show that the redox potential of the heme b3 exhibits a relatively low midpoint potential, as in related cytochrome c-dependent nitric oxide reductases. Potential implications for the coupled electron transfer and proton uptake mechanism of C-type oxidases are discussed.
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Affiliation(s)
- Frederic Melin
- Laboratoire de Bioélectrochimie et Spectroscopie, Chimie de la Matière Complexe, UMR 7140, Université de Strasbourg, 1 Rue Blaise Pascal, 67000 Strasbourg, France
| | - Hao Xie
- Max Planck Institute of Biophysics, Department of Molecular Membrane Biology, Max-von-Laue-Str. 3, D-60438 Frankfurt am Main, Germany
| | - Thomas Meyer
- Laboratoire de Bioélectrochimie et Spectroscopie, Chimie de la Matière Complexe, UMR 7140, Université de Strasbourg, 1 Rue Blaise Pascal, 67000 Strasbourg, France
| | - Young Ok Ahn
- Department of Biochemistry, University of Illinois at Urbana Champaign, USA
| | - Robert B Gennis
- Department of Biochemistry, University of Illinois at Urbana Champaign, USA
| | - Hartmut Michel
- Max Planck Institute of Biophysics, Department of Molecular Membrane Biology, Max-von-Laue-Str. 3, D-60438 Frankfurt am Main, Germany
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie, Chimie de la Matière Complexe, UMR 7140, Université de Strasbourg, 1 Rue Blaise Pascal, 67000 Strasbourg, France.
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Kinetics of cytochrome c oxidase from R. sphaeroides initiated by direct electron transfer followed by tr-SEIRAS. Bioelectrochemistry 2016; 112:1-8. [PMID: 27398977 DOI: 10.1016/j.bioelechem.2016.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 06/18/2016] [Accepted: 06/24/2016] [Indexed: 11/20/2022]
Abstract
Time-resolved surface-enhanced IR-absorption spectroscopy (tr-SEIRAS) has been performed on cytochrome c oxidase from Rhodobacter sphaeroides. The enzyme was converted electrochemically into the fully reduced state. Thereafter, in the presence of oxygen, the potential was switched to open circuit potential (OCP). Under these conditions, the enzyme is free to undergo enzymatic oxidation in the absence of an external electric field. Tr-SEIRAS was performed using the step-scan technique, triggered by periodic potential pulses switching between - 800mV and OCP. Single bands were resolved in a broad band in the amide I region using phase sensitive detection. Amplitudes of these bands were analyzed as a function of time. Time constants in the ms time scale were considered in terms of conformational changes of the protein secondary structures associated with the enzymatic turnover of the protein.
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Teh BS, Lau NS, Ng FL, Abdul Rahman AY, Wan X, Saito JA, Hou S, Teh AH, Najimudin N, Alam M. Complete genome sequence of the thermophilic Thermus sp. CCB_US3_UF1 from a hot spring in Malaysia. Stand Genomic Sci 2015; 10:76. [PMID: 26457128 PMCID: PMC4599208 DOI: 10.1186/s40793-015-0053-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 07/28/2015] [Indexed: 02/08/2023] Open
Abstract
Thermus sp. strain CCB_US3_UF1 is a thermophilic bacterium of the genus Thermus, a member of the family Thermaceae. Members of the genus Thermus have been widely used as a biological model for structural biology studies and to understand the mechanism of microbial adaptation under thermal environments. Here, we present the complete genome sequence of Thermus sp. CCB_US3_UF1 isolated from a hot spring in Malaysia, which is the fifth member of the genus Thermus with a completely sequenced and publicly available genome (Genbank date of release: December 2, 2011). Thermus sp. CCB_US3_UF1 has the third largest genome within the genus. The complete genome comprises of a chromosome of 2.26 Mb and a plasmid of 19.7 kb. The genome contains 2279 protein-coding and 54 RNA genes. In addition, its genome revealed potential pathways for the synthesis of secondary metabolites (isoprenoid) and pigments (carotenoid).
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Affiliation(s)
- Beng Soon Teh
- Centre for Chemical Biology, Universiti Sains Malaysia, Penang, Malaysia ; Present address: Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Nyok-Sean Lau
- Centre for Chemical Biology, Universiti Sains Malaysia, Penang, Malaysia
| | - Fui Ling Ng
- School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | | | - Xuehua Wan
- Advanced Studies in Genomics, Proteomics and Bioinformatics, University of Hawaii, Honolulu, Hawaii USA
| | - Jennifer A Saito
- Advanced Studies in Genomics, Proteomics and Bioinformatics, University of Hawaii, Honolulu, Hawaii USA
| | - Shaobin Hou
- Advanced Studies in Genomics, Proteomics and Bioinformatics, University of Hawaii, Honolulu, Hawaii USA
| | - Aik-Hong Teh
- Centre for Chemical Biology, Universiti Sains Malaysia, Penang, Malaysia
| | - Nazalan Najimudin
- School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - Maqsudul Alam
- Advanced Studies in Genomics, Proteomics and Bioinformatics, University of Hawaii, Honolulu, Hawaii USA ; Department of Microbiology, University of Hawaii, Honolulu, Hawaii USA
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Siletsky SA, Belevich I, Soulimane T, Verkhovsky MI, Wikström M. The fifth electron in the fully reduced caa3 from Thermus thermophilus is competent in proton pumping. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1827:1-9. [DOI: 10.1016/j.bbabio.2012.09.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 09/21/2012] [Accepted: 09/24/2012] [Indexed: 11/26/2022]
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9
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Radzi Noor M, Soulimane T. Bioenergetics at extreme temperature: Thermus thermophilus ba(3)- and caa(3)-type cytochrome c oxidases. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:638-49. [PMID: 22385645 DOI: 10.1016/j.bbabio.2011.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 08/11/2011] [Accepted: 08/12/2011] [Indexed: 10/28/2022]
Abstract
Seven years into the completion of the genome sequencing projects of the thermophilic bacterium Thermus thermophilus strains HB8 and HB27, many questions remain on its bioenergetic mechanisms. A key fact that is occasionally overlooked is that oxygen has a very limited solubility in water at high temperatures. The HB8 strain is a facultative anaerobe whereas its relative HB27 is strictly aerobic. This has been attributed to the absence of nitrate respiration genes from the HB27 genome that are carried on a mobilizable but highly-unstable plasmid. In T. thermophilus, the nitrate respiration complements the primary aerobic respiration. It is widely known that many organisms encode multiple biochemically-redundant components of the respiratory complexes. In this minireview, the presence of the two cytochrome c oxidases (CcO) in T. thermophilus, the ba(3)- and caa(3)-types, is outlined along with functional considerations. We argue for the distinct evolutionary histories of these two CcO including their respective genetic and molecular organizations, with the caa(3)-oxidase subunits having been initially 'fused'. Coupled with sequence analysis, the ba(3)-oxidase crystal structure has provided evolutionary and functional information; for example, its subunit I is more closely related to archaeal sequences than bacterial and the substrate-enzyme interaction is hydrophobic as the elevated growth temperature weakens the electrostatic interactions common in mesophiles. Discussion on the role of cofactors in intra- and intermolecular electron transfer and proton pumping mechanism is also included.
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Affiliation(s)
- Mohamed Radzi Noor
- Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland
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Neehaul Y, Chen Y, Werner C, Fee JA, Ludwig B, Hellwig P. Electrochemical and infrared spectroscopic analysis of the interaction of the Cu(A) domain and cytochrome c(552) from Thermus thermophilus. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1950-4. [PMID: 22402225 DOI: 10.1016/j.bbabio.2012.02.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 02/23/2012] [Indexed: 11/28/2022]
Abstract
The hydrophobically guided complex formation between the Cu(A) fragment from Thermus thermophilus ba(3) terminal oxidase and its electron transfer substrate, cytochrome c(552), was investigated electrochemically. In the presence of the purified Cu(A) fragment, a clear downshift of the c(552) redox potential from 171 to 111mV±10mV vs SHE' was found. Interestingly, this potential change fully matches complex formation with this electron acceptor site in other oxidases guided by electrostatic or covalent interactions. Redox induced FTIR difference spectra revealed conformational changes associated with complex formation and indicated the involvement of heme propionates. This article is part of a Special Issue entitled: 17th European Bioenergetics Conference (EBEC 2012).
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Pavlou A, Soulimane T, Pinakoulaki E. Evidence for the Presence of Two Conformations of the Heme a3-CuB Pocket of Cytochrome caa3 from Thermus thermophilus. J Phys Chem B 2011; 115:11455-61. [DOI: 10.1021/jp2033356] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrea Pavlou
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Tewfik Soulimane
- Chemical and Environmental Sciences Department and Materials & Surface Science Institute, University of Limerick, Limerick, Ireland
| | - Eftychia Pinakoulaki
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
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Siletsky SA, Belevich I, Belevich NP, Soulimane T, Verkhovsky MI. Time-resolved single-turnover of caa3 oxidase from Thermus thermophilus. Fifth electron of the fully reduced enzyme converts OH into EH state. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1807:1162-9. [DOI: 10.1016/j.bbabio.2011.05.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 05/05/2011] [Accepted: 05/08/2011] [Indexed: 11/30/2022]
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Nowak C, Laredo T, Gebert J, Lipkowski J, Gennis RB, Ferguson-Miller S, Knoll W, Naumann RLC. 2D-SEIRA spectroscopy to highlight conformational changes of the cytochrome c oxidase induced by direct electron transfer. Metallomics 2011; 3:619-27. [PMID: 21541411 DOI: 10.1039/c0mt00083c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Potentiometric titrations of the cytochrome c oxidase (CcO) immobilized in a biomimetic membrane system were followed by two-dimensional surface-enhanced IR absorption spectroscopy (2D SEIRAS) in the ATR-mode. Direct electron transfer was employed to vary the redox state of the enzyme. The CcO was shown to undergo a conformational transition from a non-activated to an activated state after it was allowed to turnover in the presence of oxygen. Differences between the non-activated and activated state were revealed by 2D SEIRA spectra recorded as a function of potential. The activated state was characterized by a higher number of correlated transitions as well as a higher number of amino acids associated with electron transfer.
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Affiliation(s)
- Christoph Nowak
- Austrian Institute of Technology GmbH, AIT, Donau-City Str. 1, 1220 Vienna, Austria.
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14
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Thermus thermophilus as biological model. Extremophiles 2009; 13:213-31. [DOI: 10.1007/s00792-009-0226-6] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Accepted: 12/31/2008] [Indexed: 10/21/2022]
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Thermodynamic redox behavior of the heme centers in A-type heme-copper oxygen reductases: comparison between the two subfamilies. Biophys J 2008; 95:4448-55. [PMID: 18676644 DOI: 10.1529/biophysj.108.139493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The study of the thermodynamic redox behavior of the hemes from two members of the A family of heme-copper oxygen reductases, Paracoccus denitrificans aa3 (A1 subfamily) and Rhodothermus marinus caa3 (A2 subfamily) enzymes, is presented. At different pH values, midpoint reduction potentials and interaction potentials were obtained in the framework of a pairwise model for two interacting redox centers. In both enzymes, the hemes have different reduction potentials. For the A1-type enzyme, it was shown that heme a has a pH-dependent midpoint reduction potential, whereas that of heme a3 is pH independent. For the A2-type enzyme the opposite was observed. The midpoint reduction potential of heme c from subunit II of the caa3 enzyme was determined by fitting the data with a single-electron Nernst curve, and it was shown to be pH dependent. The results presented here for these A-type enzymes are compared with those previously obtained for representative members of the B and C families.
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Muntyan MS, Bloch DA. Study of redox potential in cytochrome c covalently bound to terminal oxidase of alkaliphilic Bacillus pseudofirmus FTU. BIOCHEMISTRY (MOSCOW) 2008; 73:107-11. [PMID: 18294138 DOI: 10.1134/s0006297908010161] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Spectroelectrochemistry was used to determine the midpoint redox potentials of heme cofactors of the caa3-type cytochrome oxidase from the alkaliphilic bacterium Bacillus pseudofirmus FTU. The apparent midpoint potentials (E(m)(app)) for the most prominent transitions of hemes a and a3 (+193 and +334 mV, respectively) were found to be similar to the values reported for other enzymes with high homology to the caa3-type oxidase. In contrast, the midpoint potential of the covalently bound cytochrome c (+89 mV) was 150-170 mV lower than in cytochromes c, either low molecular weight or covalently bound to the caa3 complex in all known aerobic neutralophilic and thermo-neutralophilic bacteria. Such an unusually low redox potential of the covalently bound cytochrome c of the caa3-type oxidase of alkaliphilic bacteria, together with high redox potentials of hemes a and a3, ensures more than twice higher difference in redox potentials inside the respiratory complex compared to the homologous mitochondrial enzyme. The energy released during this redox transition might be stored in the transmembrane H+ gradient even under low Deltap in the alkaline environment of the bacteria at the expense of a significant increase in DeltaG of the coupled redox reaction.
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Affiliation(s)
- M S Muntyan
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia.
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Affiliation(s)
- Ivano Bertini
- Magnetic Resonance Center (CERM), University of Florence, Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy.
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Hellwig P, Gomes CM, Teixeira M. FTIR spectroscopic characterization of the cytochrome aa3 from Acidianus ambivalens: evidence for the involvement of acidic residues in redox coupled proton translocation. Biochemistry 2003; 42:6179-84. [PMID: 12755620 DOI: 10.1021/bi0205348] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aa(3)-type quinol oxidase from Acidianus ambivalens is a divergent member of the heme-copper oxidases superfamily, namely, concerning the putative channels for intraprotein proton conduction. In this study, we used electrochemically induced FTIR difference spectroscopy to identify residues involved in redox-coupled protonation changes. In the spectral region characteristic for the nu(C=O) mode from protonated aspartic or glutamic acid side chains, a number of prominent features can be observed between 1790 and 1710 cm(-)(1), clearly indicating the reorganization or protonation of more than four protonatable residues upon electron transfer. A direct comparison of the Fourier-transform infrared difference spectra at different pH values reveals the noteworthy high pK of >8 for some of these residues, and the protonation of two of them. These acidic residues may play a role in the proton transport to the oxygen reducing site, in proton pumping pathways, or in protonation reactions concomitant with quinone reduction. Whereas the residues contributing between 1790 and 1750 cm(-)(1) have the typical position of an aspartic/glutamic acid side chain buried in the protein, a position closer to the surface is suggested for the residues contributing below approximately 1730 cm(-)(1). The possible involvement of residues contributing between 1750 and 1720 cm(-)(1) in the quinone binding site is demonstrated on the basis of experiments in the presence and absence of ubiquinone-2 and of the native electron carrier of the A. ambivalens respiratory chain, caldariella quinone. Most signals seen here are not observable in comparable spectra of typical members of the heme copper oxidase superfamily and thus reflect unique features of the enzyme from the hyperthermoacidophilic archaeon A. ambivalens.
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Affiliation(s)
- Petra Hellwig
- Institut für Biophysik, Universität Frankfurt, Theodor-Stern-Kai 7 Haus 75, Germany.
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